Wow. I knew perfect iphone 5 units existed, but I was starting to lose hope. Heres my journey: 1st Phone: Launch day phone. Screen clear and nice, fast hardware, instant response. Problem: Camera broken/inoperable. 2nd Phone: Yellow screen. Dingy yellow. Saw it right away. Terrible. 3rd Phone: Clear screen, good camera, performance was off. Was no faster then my 4S, static on sreen, stuff kinda jumped around, maps struggled. Like I was missing a few GPU cores. Benchmarks in the low 1100s. 4th Phone: Great performance, camera works flawlessly, yellow screen. I just want the phone thats on display at the Apple store. 5th phone: I knew it! Most beautiful, bluist, clearest most amazing screen of the bunch (matched display phones). Camera is flawless. Performance is off the charts. Smooth maps, instant everything, flawless touch response. Got my highest LTE reading yet, 65Mbps. This is the phone I've been looking for. Moral: If you thinkt he 5 feels just kinda faster then the 4s, or you arent Wowed by it's performance, get it replaced. If you think the screen on your 5 looks kinda yellow, but are trying to convince yourself it supposed to be that way due to glue or warmer calibration, get it replaced. The phone Apple intended exists out there, I encourage you to find it. It's awesome.